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Non-Current Provisions And Other Non-Current Liabilities - Disclosure of Remeasurement of Net Defined Benefit Liability Asset (Details) - EUR (€)
€ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Actuarial assumption of discount rates | Minimum      
Disclosure of net defined benefit liability (asset) [Line Items]      
Decrease in actuarial assumption (0.15%)    
Increase in actuarial assumption   1.70%  
Actuarial assumption of discount rates | Maximum      
Disclosure of net defined benefit liability (asset) [Line Items]      
Increase in actuarial assumption 0.40% 2.30%  
United Kingdom | Actuarial assumption of expected rates of inflation      
Disclosure of net defined benefit liability (asset) [Line Items]      
Decrease in actuarial assumption   (0.15%)  
Eurozone | Actuarial assumption of expected rates of inflation      
Disclosure of net defined benefit liability (asset) [Line Items]      
Decrease in actuarial assumption (0.10%)    
Increase in actuarial assumption   0.35%  
Pensions and other post-employment benefits      
Disclosure of net defined benefit liability (asset) [Line Items]      
Actuarial gains/(losses) on benefit obligations € 99 € 2,402 € 3,048
Plan assets | Pensions and other post-employment benefits      
Disclosure of net defined benefit liability (asset) [Line Items]      
Actuarial gains/(losses) on plan assets € 34 € (1,292) € (2,398)